Added in CPython 3.13.
To enable tested on Ubuntu 25.04:
git clone https://github.com/python/cpython
cd cpython
git checkout v3.13.7
./configure --enable-experimental-jit
make -jHowever, the JIT appears to be useless tested as of this Python version, lol:
We can try to test it with python/inc_loop.py:but the result is just as pathetic as without JIT currently, taking about 1 second for only 10m loops.
time ./python python/inc_loop.py 10000000This can be compared with the optimal assembly from c/inc_loop_asm.c:which does 1 billion loops in about half a second on P14s.
time ./inc_loop_asm.out 1000000000For comparison, PyPy actually speeds things up and does 1 billion loops in about a second, so only 2x worse than native.
TODO triple check that JIT is enabled. Many threads say the command is:but that fails with:
./python -c 'import sysconfig; sysconfig.get_config_var("JIT_DEPS")'ModuleNotFoundError: No module named '_sysconfigdata__linux_x86_64-linux-gnu'For comparison with a properly implemented dynamic language JIT running nodejs/inc_loop.js does 1 billion loops in 0.6s on v22.14.0, close to native.
tonybaloney.github.io/posts/python-gets-a-jit.html documents what the initial "JIT" implementation does. It is just an extremely naive concatenation of instructions that avoids a for + switch. No wonder it doesn't speed things up much at all.
Anonymous Stack Overflow users who are likely professionals hiding the company the work at by 
Ciro Santilli 37 2025-09-09
Ciro Santilli 37 2025-09-09These people are amazing:
- 2025 techcrunch.com/2025/09/01/every-fusion-startup-that-has-raised-over-100m/ Every fusion startup that has raised over $100M
Pinned article: Introduction to the OurBigBook Project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Intro to OurBigBook
. Source. We have two killer features:
- topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculusArticles of different users are sorted by upvote within each article page. This feature is a bit like:
- a Wikipedia where each user can have their own version of each article
- a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
Figure 1. Screenshot of the "Derivative" topic page. View it live at: ourbigbook.com/go/topic/derivativeVideo 2. OurBigBook Web topics demo. Source. - local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 3. Visual Studio Code extension installation.
Figure 4. Visual Studio Code extension tree navigation.
Figure 5. Web editor. You can also edit articles on the Web editor without installing anything locally.Video 3. Edit locally and publish demo. Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.Video 4. OurBigBook Visual Studio Code extension editing and navigation demo. Source. 
- Infinitely deep tables of contents:
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact